+/**
+ * modest_window_mgr_register:
+ * @self: a ModestWindowMgr instance
+ * @win: the GObject of the window to register
+ * @type: ModestWindowType of the window to register
+ * @window_id: a guint window_id of the window
+ *
+ * register a window with the ModestWindowMgr instance *self
+ *
+ * Returns: TRUE on success, else FALSE
+ */